Tiny crustaceans called copepods are the most abundant animals in the oceans, and if a new study is correct, they are more important than previously realized at helping those waters remove carbon dioxide from the atmosphere, where it drives global warming. Certain species in the North Atlantic, for example, appear to haul massive amounts of carbon to the deep ocean in their fat, which they burn off as they hibernate far below. [Source: Science / AAAS]